Here is a summary of the NWP output for noon (GMT) on Saturday.
Issued 0507z, 15th July 2008

The end of the weekend and start of next week will see a ridge moving in
from the west, with a brief settled spell as a result. Before then though
there's likely to be widespread rain as a trough moves eastwards.

Analysis and evolution to T+120 via GFS
http://85.214.49.20/pics/Rtavn001.png
WSW'lies cover the UK, with low pressure to the north and a trough to the
west. Tomorrow the winds become westerlies as the trough moves eastwards,
followed by by further westerlies on Thursday. Friday sees a secondary low
over the North Sea and a mixture of WNW'lies and westerlies as a result.

T+120 synopsis
http://85.214.49.20/pics/Rtavn12014.png /
http://85.214.49.20/pics/Rtavn1201.png
http://85.214.49.20/pics/Rukm1201.gif
http://85.214.49.20/pics/Recm1201.gif /
http://www.meteociel.fr/modeles/nogapse_cartes.php
The jetstream chart shows a trough over the UK, with a ridge to the west. At
the 500hPa level there's also a trough over the UK, with upper NW'lies. MetO
shows less of a trough, with upper WNW'lies, while ECM brings upper
westerlies. GEM shows upper WNW'lies with a trough to the east.
At the surface GFS has NW'lies or NNW'lies for most, with low pressure over
the North Sea and a weak ridge to the west. MetO shows a trough to the east
and WNW'lies for the UK. WNW'lies also feature on the ECM output, again due
to a trough to the east. GEM brings a weak ridge over the UK, with WNW'lies.

Evolution to T+168
Day 6 with ECM shows a ridge over Ireland and NW'lies for all. The winds
become SW'lies on day 7 as the ridge moves eastwards.
GFS also brings a ridge for Ireland and NW'lies for the UK on day 6. On day
7 the winds become SW'lies as pressure builds to the east.

Looking further afield
On day 8 with ECM high pressure builds to the east, helped by a deep trough
from ex-Bertha to the west. Southerlies and SSW'lies bring hot air over the
UK, followed by strong SW'lies as ex-Bertha approaches the UK on day 9. By
day 10 the low deepens to the WNW, with strong SW'lies for most.
Further SW'lies cover the UK on day 8 with GFS, followed by westerlies on
day 9 as a weak ridge moves eastwards. On day 10 ex-Bertha lies to the NW,
with strong SW'lies for all.

Ensemble analysis
(http://91.121.94.83/modeles/gens/gra...ille=Lond res)
The ensembles show a warm day today, followed by a week-long colder spell.